摘要
为研究重力热管内部沸腾冷凝过程,使用Fluent 6.3选用VOF多相流模型对汽液两相流进行数值模拟。通过加载自定义函数(UDF),对重力热管的传热传质过程进行模拟计算,获得了稳定的温度场。随着蒸发段热流量的不断输入,热管内部液池内的气泡生成、合并、长大、上升,最终达到稳定的核态沸腾,以及在冷凝段壁面凝结形成液膜并回流的质热传递的全过程。计算得到的壁面温度与实验测量值相一致,表明通过编写UDF程序及选取多相流模型(VOF)建立的数值模型,可以对管内流体的蒸发冷凝进行模拟。研究结果对热管的研究设计提供了参考。
To study the process of condensation and boiling in thermosyphon, used VOF muhiphase flow model in Fluent6. 3 to simulate vapor - liquid two - phase flow. By loading a user - defined func- tion （ UDF）, simulated the process of thermosyphon~ heat and mass transfer, the stable temperature field was taken. With the continuous input of the heat flow in evaporation section, inside the heat pipe, the bubble formation, merger, growth and rising in liquid pool, and finally reached steady nucle- ate - boiling state, and formed liquid films on the wall and return in thermosyphon. The wall tempera- ture was consistent with experimental measurements show that through write the UDF program and select muhiphase flow model （VOF） to establish the numerical model can simulate the fluid＇s evaporation and condensation in a tube. The results provided a reference for the design of heat pipe.
出处
《冶金能源》
2016年第1期30-34,43,共6页
Energy For Metallurgical Industry
基金
国家自然科学基金(61473056)
关键词
重力热管
VOF模型
蒸发冷凝
液膜
thermosyphon VOF model evaporation - condensation liquid film
